allpondsolutions 36w UV Light Steriliser for Pond & Aquarium - CUV-136 Fish Tank & Pond Clarifier - Helps Remove Algae and Greenwater

Works really well. Water went from dark green to crystal clear in about a week. That will obviously depend on pond size.

I've had different shapes and sized ponds for 15 years now with a fairly high stock of fish and I've bought 3 of these over the years, they are a great product and last the distance, very easy to change UV bulbs which usually last a couple of years, only reason I had to buy a third one was because the garden flooded and submersed it and blew, that doesn't bother me as it does state that they are waterproof and are not submersible so remember to keep them off the ground. Always had them connected before my filters or before the bio media filter and I've had no algae or bacterial problems for years... It's great for ponds that use water pumps (Gravity fed drain systems are perfect but would still use these in my experience) as the tabulated system inside allows the water to stay in the UV chamber for longer without slowing down the water pressure allowing it to be exposed to the UV for longer to kill parasites and not just little bacteria or algae. With this style UV that has the tabulated system inside i would highly recommend it over just a clarifier. Considering it's a lot cheaper than the likes of an Evo clarifier and at a bigger wattage is a win win, nothing against Evo they are great products but these do the job perfectly for a lower price.

Read the manual before buying.The Ballast is roughly 1m from the end of the cable, so shortening the cable is not possible.The device draws 29.5W, according to my wattmeter, during testing, and the ballast becomes mildly warm.The unit has its I/O in multiple directions, so do consider where it is to go. The Ballast is also reasonably large.The unit is elementary to put together and didn't leak - good.I will update the review in a week or so and comment on the water clarity.The viewports are useless in a UK summer sun. I will try them again later tonight.The best part by far is the transparent hose tail with the spinning propeller inside, showing water flow.Update 2 weeks later. My small 1000L pond is now crystal clear after being green for years. Fustratingly, I also a month ago improved by mechanical filtering, so this is not a scientific test.

Nice product working well

My pond holds 4000 litres I bought this uvc to get rid of the pea green soup which was my pond water where I keep goldfish which I couldn't see anymore the cause was algaeI tried well none brands of algae remover but it didn't work after a month of treatment I know it can take up to a month to work successfullyTHIS ULTRA VIOLET CLARIFIER cleared my pond in 4 days I can now see the bottom of the pond and my beautiful fish friend'sOnly negative is i never took before and after picturesHighly recommended this product if you have algae problems and also shading the pond helps

The media could not be loaded. This was a fantastic buy. I have a 3000 ltr pond which was worse than pea soup.I was incredibly skeptical as to it's capabilities. I bought the UV for a 7000 ltr pond. It arrived quickly and it was reasonably priced. It has now been on three weeks .Today as well as seeing my fish ,for the first time in months I can see the bottom of the pond!!!!!! I would recommend cleaning the filter after about two weeks at most. I will clean it again next week and then just do it every 3to 4 months. Ps. I am not a robot !!!

I have used this uv filter all summer and have not suffered any algal bloom in my ponds. Couldn't be happier with its performance and wished I'd bought it years ago. It is much bigger than I expected and was a challenge to fit in tight space. Very sturdy unit and I highly recommend it.

PLEASE BE AWAREThis eats through bulbs.Ours has only been in use 2 months and the bulb has blown already despite there being no other factors come into play.I would not recommend this product based on this sadly as its going to cost alot to keep up with the bulb purchases at this rate.Very disappointing product.Reached out to seller,but they are unable to help.